Microwave-to-Optical Quantum Transduction Utilizing the Topological
Faraday Effect of Topological Insulator Heterostructures
- URL: http://arxiv.org/abs/2311.07293v1
- Date: Mon, 13 Nov 2023 12:35:33 GMT
- Title: Microwave-to-Optical Quantum Transduction Utilizing the Topological
Faraday Effect of Topological Insulator Heterostructures
- Authors: Akihiko Sekine, Mari Ohfuchi, Yoshiyasu Doi
- Abstract summary: We show that three-dimensional topological insulator thin films exhibit a topological Faraday effect independent of the sample thickness.
This leads to a large Faraday rotation angle and therefore enhanced light-magnon interaction in the thin film limit.
- Score: 0.05524804393257919
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: The quantum transduction between microwave and optical photons is essential
for realizing scalable quantum computers with superconducting qubits. Due to
the large frequency difference between microwave and optical ranges, the
transduction needs to be done via intermediate bosonic modes or nonlinear
processes. So far, the transduction efficiency $\eta$ via the magneto-optic
Faraday effect (i.e., the light-magnon interaction) in the ferromagnet YIG has
been demonstrated to be small as $\eta\sim 10^{-8} \mathrm{-} 10^{-15}$ due to
the sample size limitation inside the cavity. Here, we take advantage of the
fact that three-dimensional topological insulator thin films exhibit a
topological Faraday effect that is independent of the sample thickness. This
leads to a large Faraday rotation angle and therefore enhanced light-magnon
interaction in the thin film limit. We show theoretically that the transduction
efficiency can be greatly improved to $\eta\sim10^{-4}$ by utilizing the
heterostructures consisting of topological insulator thin films such as
Bi$_2$Se$_3$ and ferromagnetic insulator thin films such as YIG.
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